Prototype serializing Table/QTable with the ASDF core table tag

[eslavich]

This is a prototype showing one option for implementing support for serializing astropy Table/QTable using the ASDF core table tag (instead of the astropy tag).

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.51%. Comparing base (b532105) to head (48266f3).
⚠️ Report is 396 commits behind head on main.

Files with missing lines	Patch %	Lines
asdf_astropy/converters/table/table.py	77.77%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #211      +/-   ##
==========================================
- Coverage   98.64%   98.51%   -0.13%     
==========================================
  Files          55       55              
  Lines        2060     2094      +34     
==========================================
+ Hits         2032     2063      +31     
- Misses         28       31       +3     

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